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\section{Introduction}  Edge detection is \textbf{required for interpretation of gravity field data},and has been widely used in tectonic studies and mineral explorations\cite{Paterson_1985}. To gain a better understanding of gravity sources,\textit{a variety of methods based on the use of directional} derivatives of different orders have been developed to locate anomalous source boundaries.\\ boundaries.\\\verb||  \begin{itemize}  \item 123\\456\\789\item 123 first1\item second2  \end{itemize}  In this paper,   \begin{enumerate}  \item 123\item 123 first11\item second22  \end{enumerate}  we propose an edge detection method based on the analysis of eigenvalues of GGT.\begin{quote}  Considering the actual geological situation;